[eesmith]

"TOTP for 2FA is incredibly easy to implement. So what's your excuse?" shows how to do it in Python. https://drewdevault.com/2022/10/18/TOTP-is-easy.html .

Though Python would be a 3rd party dependency. ;)

HN comments about that article at https://news.ycombinator.com/item?id=33245042 . Including some of the problems people have had with 2FA usability.